The method is based on Pulse echo characteristic in oil film. Separatingone pulse echo from reflected pulses, the oil film change is demonstrated.
其基本原理是超声波在油膜层中的反射波中分离出一条与油膜厚度的变化同步变化的反射脉冲井进行处理以显示油膜厚度。
When the radar seeker transmits several different frequency pulses, the echo amplitude of the target follows the Rayleigh distribution and that of the decoy is assumed fixed.
当导引头雷达发射多个不同频率的脉冲信号时，在一定的检测处理时长内目标回波信号幅度服从瑞利分布，而诱饵干扰信号则是幅度固定的。
A device used underwater to produce pulses of sound, as for an echo sounder.
特殊设计的专用降噪消声装置的采用，极大的抑制了机械噪声。
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